61551956002 has 4 divisors (see below), whose sum is σ = 92327934006. Its totient is φ = 30775978000.

The previous prime is 61551955963. The next prime is 61551956003. The reversal of 61551956002 is 20065915516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 50328884281 + 11223071721 = 224341^2 + 105939^2 .

It is not an unprimeable number, because it can be changed into a prime (61551956003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15387988999 + ... + 15387989002.

Almost surely, 2^61551956002 is an apocalyptic number.

61551956002 is a deficient number, since it is larger than the sum of its proper divisors (30775978004).

61551956002 is a wasteful number, since it uses less digits than its factorization.

61551956002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30775978003.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 61551956002 in words is "sixty-one billion, five hundred fifty-one million, nine hundred fifty-six thousand, two".